Pipiza noctiluca - a hoverfly

the black colouration, with the two orange marks near the top of the abdomen, plus the general proportions, are all perfect for the genus Pipiza. The front feet are too dark for P. luteitarsis. After that it gets difficult, as you really need to see the shape of the hind femur to separate the two remaining common possibilities, which are P. noctiluca (rather unremarkable hind thighs and P. austriaca (very broad, ridged, hind thighs). P. noctiluca females almost always show the orange marks, but P. austriaca almost always do not; it is therefore more likely to be P. noctiluca. However, a couple of rarer species are also just about possible, so this is best labelled as Pipiza sp.